145 lines
8.3 KiB
HTML
145 lines
8.3 KiB
HTML
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<title>std::basic_string_view<CharT,Traits>::find_last_of</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_string_view<CharT,Traits>::</span>find_last_of</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-string.html">string</a>‎ | <a href="cpp-string-basic_string_view.html">basic string view</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> size_type find_last_of<span class="br0">(</span>basic_string_view v, size_type pos <span class="sy1">=</span> npos<span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> size_type find_last_of<span class="br0">(</span>CharT c, size_type pos <span class="sy1">=</span> npos<span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> size_type find_last_of<span class="br0">(</span><span class="kw4">const</span> CharT<span class="sy2">*</span> s, size_type pos, size_type count<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> size_type find_last_of<span class="br0">(</span><span class="kw4">const</span> CharT<span class="sy2">*</span> s, size_type pos <span class="sy1">=</span> npos<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<p>寻找最后一个给定字符序列中字符之一相等的字符。不指定准确的搜索算法。搜索只考虑区间 <span class="texhtml" style="white-space: nowrap;">[0; pos]</span> 。若区间中不存在字符，则将返回 <span class="t-lc"><a href="cpp-string-basic_string_view-npos.html">npos</a></span> 。</p>
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<div class="t-li1"><span class="t-li">1)</span> 寻找此视图中 <code>v</code> 的任意字符的最后一次出现，到位置 <code>pos</code> 结束。</div>
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<div class="t-li1"><span class="t-li">2)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">find_last_of<span class="br0">(</span>basic_string_view<span class="br0">(</span><a href="cpp-memory-addressof.html"><span class="kw757">std::<span class="me2">addressof</span></span></a><span class="br0">(</span>c<span class="br0">)</span>, <span class="nu0">1</span><span class="br0">)</span>, pos<span class="br0">)</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">3)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">find_last_of<span class="br0">(</span>basic_string_view<span class="br0">(</span>s, count<span class="br0">)</span>, pos<span class="br0">)</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">4)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">find_last_of<span class="br0">(</span>basic_string_view<span class="br0">(</span>s<span class="br0">)</span>, pos<span class="br0">)</span></span></span> 。</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>v</td>
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<td>-</td>
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<td>要搜索的视图</td>
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</tr>
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<tr class="t-par">
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<td>pos</td>
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<td>-</td>
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<td>要开始搜索的位置</td>
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<tr class="t-par">
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<td>count</td>
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<td>-</td>
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<td>要搜索的字符串的长度</td>
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</tr>
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<tr class="t-par">
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<td>s</td>
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<td>-</td>
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<td>指向要搜索的字符串的指针</td>
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<tr class="t-par">
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<td>ch</td>
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<td>-</td>
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<td>要搜索的字符</td>
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</tr>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>子串的任意字符的最后一次出现位置，或者若找不到这些字符则为 <span class="t-lc"><a href="cpp-string-basic_string_view-npos.html">npos</a></span> 。</p>
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<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">复杂度</span></h3>
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<p>最坏情况为 O(<code>size()</code> * <code>v.size()</code>) 。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-basic_string_view-find.html"><span class="t-lines"><span>find</span></span></a></div>
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</div>
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</td>
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<td>在视图中查找字符<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-basic_string_view-rfind.html"><span class="t-lines"><span>rfind</span></span></a></div>
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</div>
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</td>
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<td>寻找子串的最后一次出现<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-basic_string_view-find_first_of.html"><span class="t-lines"><span>find_first_of</span></span></a></div>
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</div>
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</td>
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<td>查找字符的首次出现<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-basic_string_view-find_first_not_of.html"><span class="t-lines"><span>find_first_not_of</span></span></a></div>
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</div>
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</td>
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<td>查找字符的首次不出现<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-basic_string_view-find_last_not_of.html"><span class="t-lines"><span>find_last_not_of</span></span></a></div>
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</div>
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</td>
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<td>查找字符的最后一次不出现<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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</div>
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